Number by catalogue:  Yvert: 2248   Scott: 1203  

Perforation type: 14 ½x14 ½

Subject:

81 cents. The windmill using a strength of wind for pumping out of water polders*

Additional:

*A polder is a low-lying tract of land enclosed by embankments known as dikes, that forms an artificial hydrological entity, meaning it has no connection with outside water other than through man operated devices

Topics: Wind pumps and farm windmill Windmills

Number by catalogue:  Yvert: 2249   Scott: 1204  

Perforation type: 14 ½x14 ½

Subject:

81 cents. The big chinese hydraulic wheel for irrigation

Additional:

Look also at the FDC of this issue

Topics: Irrigation and water wheels